Simple and cooperative electrostatic binding of ammonium ions to phosphate polyions: NMR, infrarred and theoretical study

Article Abstract:

A study conducted, showed that both methyl ammonium and tetramethylammonium ions bind to the polyanion of a polyphosphate in a simple equilibrium. Using a combination of FTIR spectra and high level quantum-mechanical calculations it is proposed that the binding product in both cases has the nature of hydrated contract ion pair, in which three immediately bound water molecules increase the distance between oppositely charged ions and thus decrease the energy of electrostatic binding.

Phosphates, Ions, Chemistry, Physical and theoretical, Physical chemistry, Ammonium compounds, Ammonium chloride, Ammonium paratungstate, Ammonium salts

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Cooperative hydrogen bonds of macromolecules. 3. A model study of the proximity effect

Article Abstract:

An experimental model and a theoretical study of bonding of low molecular-weight hydrogen bond donors containing one or two donor (carboxylic) groups with a polymeric acceptor poly (4-vinylpyridine) (PVP) is presented.

Science & research, Plastics Material and Resin Manufacturing, Plastics materials and resins, Polyvinyl Acetals, Polyvinyl Acetal Plastics, Research, Nuclear magnetic resonance spectroscopy, Spectra, Hydrogen bonding, Hydrogen bonds, Density functionals, Density functional theory, Carboxylic acids, Mechanical properties, Structure

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